Noura Aknin - Academia.edu (original) (raw)
Papers by Noura Aknin
2020 Global Congress on Electrical Engineering (GC-ElecEng), 2020
A wearable textile circular ring slot antenna based on a substrate integrated waveguide cavity is... more A wearable textile circular ring slot antenna based on a substrate integrated waveguide cavity is presented. In this paper, the focus is on studying and understanding the technical behavior of the SIW textile antenna when located near the human body. Thus, based on the electrical properties of conductive material and the dielectric characteristics of the Felt substrate, a 5.5GHz electro-textile antenna was designed. The proposed antennas are simulated in free space, while the performance of antenna is investigated for on-body condition. The simulated impedance bandwidths of the proposed antenna in free space and on phantom are 120MHz and 110MHz at 5.5GHz respectively. The efficiencies of the antenna at 5.5GHz are 95.8% in free space, and 91.6% on phantom, respectively, meanwhile the gains of that are 8.64dB and 9.35dB, respectively.
2020 International Conference on Electrical, Communication, and Computer Engineering (ICECCE), 2020
Fog computing is an evolution of cloud computing paradigm, whose key point is the location of com... more Fog computing is an evolution of cloud computing paradigm, whose key point is the location of computing resources at the edge of the network. Data center facilities at the fog level are smaller than those at the cloud level, but nevertheless, they may share similar topologies, such as fat tree or leaf and spine architectures. In this paper, a formal algebraic specification of an IoT/Fog environment based on each of both architectures is presented, where users may be moving around and their associated computing assets are meant to migrate among hosts in order to follow their respective users so as to be as close as possible to them.
Transactions on Machine Learning and Artificial Intelligence, 2017
In this research, we will present all the concepts necessary for the implementation of a warehous... more In this research, we will present all the concepts necessary for the implementation of a warehouse of educational components. We define three classes of educational components: Learning components, services components and technical components. We built a metadata schema to describe them. We will study the warehouse architecture and how the actors interact with it. We will also see the features implemented at the indexing and search system that integrates. The aim is to clarify the strategic solutions we have adopted to create a generic platform, adaptable and scalable. The instantiation of this platform provides the Educational Component Repository.
International Journal of Organizational and Collective Intelligence, 2015
Recently, Social tagging systems (folksonomies) have become very popular platforms where content ... more Recently, Social tagging systems (folksonomies) have become very popular platforms where content is created collaboratively by users. This kind of environments allows users to assign shared resources with freely chosen keywords (tags). Folksonomies provide a valuable addition to the knowledge organization methods since they allow users to choose vocabularies that meet their real tastes and cognition. However, the lacking of standardization and the flat structure of tags in folksonomies pose challenges for folksonomy searching and information retrieval. Several researches have been proposed to overcome these drawbacks. In this paper, the authors present, describe and compare the most relevant approaches to capturing hidden semantics in folksonomies and turning it into ontologies. The authors also present and describe many techniques, tools and online resources that can be useful in working on such systems. Finally, the authors propose an approach to extract ontology from social taggi...
International Journal of Engineering Trends and Technology, 2017
cloud storage service (STaaS) are increasingly gaining popularity and becoming one of the major s... more cloud storage service (STaaS) are increasingly gaining popularity and becoming one of the major service in cloud computing. Nowadays, although many cloud storage services available on the internet they aren’t convenient and they have many challenges to apply it and benefit from it. In this paper, we will implement the model data backup technologies of our cloud storage architecture on a cloud computing simulation toolkit known as cloudsim using snapshot Amazon ec2 and disk-todisk. We will present the new concept for cloud storage architecture to be able to store and backup data through model controller in layer backup technology that can be accessed through the APIs. The implementation aims to increase the availability of data, modernizing data protection and reduce in loss of data in the cloud storage environments. Also this solution could provide new information and gives addition that is useful for further researches and open new opportunity for the future cloud storage.
Annales Des Télécommunications, 1998
In this paper, an extension of the mode matching method to the analysis of uniaxial anisotropic d... more In this paper, an extension of the mode matching method to the analysis of uniaxial anisotropic dielectric resonators is presented. The study will focus on the dominant TEol ~ though an extension to higher order modes is so'aighOeorward. The dependency of the dominant mode resonant frequency on the anisotropy parameters is analyzed in detail. Numerical results are in a very good agreement with the literature. ANALYSIS OF UNIAXIAL ANISOTROPIC DIELECTRIC RESONATORS BY THE METHOD OF MODE MATCHING R~sum6 Dans cet article, une extension de la mdthode du raccordement modal pour la ddtermination des fr6quences de rdsonance dans le cas d'un rdsonateur didlectrique (RD) anisotrope uniaxial de forme cylindrique est prdsentde. L'dtude sera limitde au mode fondamental TEoi 5. Des rdsultats numdriques importants sont present,s, ~ savoir la d6pendance de la frdquence de r6sonance des deux premiers 61dments du tenseur permittivit6 uniquement. Aussi, la sensibilit6 de la fr6quence de rdsonance aux diff6rentes perturbations de dimensions et de permittivitd est analysde.
Web 2.0 and Web 3.0 : Improve the quality of learning and minimize its cost. Adaptation process :... more Web 2.0 and Web 3.0 : Improve the quality of learning and minimize its cost. Adaptation process : personalize research data and its presentation to learners. Implementation : Fictional model to assist the learner in this massive and varied set of data.
Planning and dimensioning process of a multi-service network WCDMA should consider the whole para... more Planning and dimensioning process of a multi-service network WCDMA should consider the whole parameters characterising the radio cell. Among these, we are interested in the required total BTS power and maximum capacity supported by the cell in the downlink direction. This direction requires more radio resources, thus it is more delicate to optimize. In this context, we express these two parameters as a function of the quality of service (QoS) received at the level of a mobile station activating a certain service (voice, video, etc) and as a function of various radio interface problems such as: multipath, neighbouring cells effect, pathloss, thermal noise due to equipment, etc. Keywords— WCDMA, downlink, multi-service network, capacity estimation, interferences, total power BTS estimation.
Since the appearance of the web 2.0, several new concepts have emerged like social networks which... more Since the appearance of the web 2.0, several new concepts have emerged like social networks which generate big data, characterized by a difficult treatment using traditional administration tools. Though, they represent a rich resource of information that we can use as the basis for decisions to help managers which are always complaining about the time taken to get answers to questions in order to make decisions, and also about the quality of these decisions. In the decision-making task, the most important besides treating the data, especially big data, is to analyze and interpret the results of the treatment in a way to maximize the profit in terms of business management logic. So, we propose in this paper a process-oriented business architecture, founded on users’ interests, by analyzing tweets as an example of big data, for decisionmaking purposes, dealing with the practical functions of text mining. The business orientation of the analysis helps us to get conscious decisions whic...
Since 2004, the web 2.0 has been based on the contributions and the interaction of internet users... more Since 2004, the web 2.0 has been based on the contributions and the interaction of internet users to easily produce and publish the content. This type of philosophy which has been approved by the web community encourages users to participate and exchange, has resulted in a huge mass of diverse information. However, this philosophy based on the collaboration of users brings many problems such as the information overload, the lack of information quality’s control, the search results accuracy and possibilities of sorting and classifying by the level of relevancy. This paper is a part of a work research conducted in our laboratory that focuses on the quality of information on the collaborative web and its related issues. We propose a content management framework that will handle the content during its lifetime on the web. Our approach reuses the static validation mechanism of content and adds the concept of dynamic validation mechanism performed by internet user’s community. In this con...
Journal of Education and Vocational Research, 2015
With the emergence of the digital world, data access has become an action as quick and direct tha... more With the emergence of the digital world, data access has become an action as quick and direct that many questions arise about the reliability and value of information. However, the data returned by the online search engines are based on an open and massive environment, which include data of any type, which come from different sources of information. Indeed, in the field of education and especially when using online search, the learner is left with a set of heterogeneous information that does not exist in an orderly format and are not easy to consume. This aspect of data variety represents the second V in the design of the Big Data phenomenon. With the aim to support learners in their search for information, it is proposed to design a specialized structuring tool to combine process and classify the variety of these massive data so they can provide the best result to the learner. The present article deals with the descriptive study of the current state of using online search by UAE...
International Journal of Emerging Technologies in Learning (iJET), 2019
The most of collected data samples from E-learning systems consist of correlated information caus... more The most of collected data samples from E-learning systems consist of correlated information caused by overlapping input instances, which decrease the classifier credibility and reliability. This paper presents an improved classification model based on Deep Learning and Principal Component Analysis (PCA) method as its use in reducing the dimensionality of data. By this task, we introduce the best learning process to extract just the useful parameters that describe students’ per-formances in an E-learning system. One of the primary goals of this technique is to help earlier in detecting the dropouts and discovering of students who need special attention, so that the teachers could provide the appropriate counseling at the right time. This study presents the proposal approach and its algorithms. In addition, it shows how deep neural network was modeled in the training phase, and how PCA helps in the elimination of correlated information in our dataset to increase the classifier perfor...
International Journal of Information Technology and Computer Science, 2016
The Uplink Synchronous Transmission Scheme [1], is a technique used by operators, that exploit th... more The Uplink Synchronous Transmission Scheme [1], is a technique used by operators, that exploit the uplink orthogonality, to reduce multiple access interferences in uplink direction and consequently to increase uplink capacity. The USTS gives better performances when we have an ideal case presented by no channelization code restrictions per scrambling code. In reality, channelization codes are limited. To resolve this problem, several scrambling codes are used to admit more users in the cell. However, the use of different scrambling codes increases the multiple access interference and consequently decreases uplink capacity gain, since signals transmitted by users under different scrambling codes are non-orthogonal. To obtain more performances and therefore to increase the uplink capacity gain, we will study the introduction of a multiuser detector for interferences cancellation, in uplink synchronous mode. For that, two values of interference cancellation efficiency of the multiuser detector are considered. In this study, only the multiple access interference is reduced. To show the effect of other-cell interferences on uplink synchronous mode capacity, two scenarios are considered: an isolated cell and a multiple cell network.
International Journal of Innovation and Applied Studies, Oct 2, 2013
The printed antenna is one of the best antenna structures, due to its low cost and compact design... more The printed antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, we present a new approach to improve the radiation effectiveness and the performance of antennas by miniaturization of the size. Indeed, we have studied the performance of ultra wideband antenna which consists of a ring-shaped patch. This study was made for the whole frequency band of UWB ranging from 2.5GHz to 9.4GHz and the geometry of the antenna and the results were obtained using the simulation software CST Studio microwaves. The detailed design and the results are shown and discussed in this paper.
International Journal of Innovation and Applied Studies, Jun 15, 2013
Content Management Systems (CMS) provide to its users the ability to publish on the Web with no n... more Content Management Systems (CMS) provide to its users the ability to publish on the Web with no need to have experience in developing web pages, this way CMS also participates in the expansion of reducing quality of content placed on the web similarly to Web 2.0 tools. The mechanism of validating content indicates a high level of quality content control while putting users as main players according to Web 2.0 standards, from this prospects we develop Validated Content Management System VCMS as a new Web 2.0 tool that supports content validation mechanism. The VCMS system requires collaboration between users when content is being static validated. Real-time synchronization between users during collaboration on the same project can make this process easier and brings more rapidity to content publication while maintaining the mechanisms that allows quality control in our system. In this article we present the technic of implementing real time interaction between users during collaboration on the same content. We focus on promoting the What You See Is What You Get (WYSIWYG) editor to support Real-time collaboration between multiple content generators.. The approach presented in this paper can be integrated to any collaborative Content Management System and also can be used in all collaborative applications that generate Web content such as blogs or wikis offering to these tools the feature of collaborating on the same content between multiple users in real-time.
A novel wideband rectangular dielectric resonator antenna (DRA) is proposed in this paper. A hybr... more A novel wideband rectangular dielectric resonator antenna (DRA) is proposed in this paper. A hybrid structure with an isolated dielectric resonator (DR) and an equivalent air-dielectric DR is introduced by lifting the resonator from the ground plane. The hybrid structure is excited by a slot-fed mechanism to obtain a smooth transition between each resonant mode. The resonant modes of the isolated DR and the equivalent DR are merged together to form a wideband impedance bandwidth. It is found that the bandwidth of the proposed antenna can be greatly enhanced by using the hybrid DRA structure instead of the case mounted on the ground plane. A detailed parametric study is carried out to analyze the characteristics of the proposed antenna. Measured results show that the proposed DRA has a 10 dB impedance bandwidth of 61% from 2.4 GHz to 4.5 GHz and the radiation pattern is stable through the operating frequency.
International Journal of Information Technology and Computer Science, 2012
Web 2.0 makes users the main actors for publishing content and creating applications on the web. ... more Web 2.0 makes users the main actors for publishing content and creating applications on the web. The increasing of information overload and consequently the decrease of its quality are the main problems of this domain. Content Management Systems (CMS) provide the ability to publish on the web by offering simple publishing tools for ordinary users with no technical skills. Content available on the web created using the CMS is not well controlled and requires efficient process that evaluates its quality. Therefore, Content Management Systems contribute to the problem related to information and content quality similarly to Web 2.0 tools. The mechanism of validating content has proved a high-level of content's quality control by involving users in the process according to Web 2.0 philosophy. From these perspectives, we develop Validated Content Management System (VCMS) as a new Web 2.0 tool that supports content validation mechanisms. This article presents the VCMS and its ability to provide an effective quality control for web content. We introduce a new manner of collaborative publishing and we give an overview about features of our system and its core architecture.
2020 Global Congress on Electrical Engineering (GC-ElecEng), 2020
A wearable textile circular ring slot antenna based on a substrate integrated waveguide cavity is... more A wearable textile circular ring slot antenna based on a substrate integrated waveguide cavity is presented. In this paper, the focus is on studying and understanding the technical behavior of the SIW textile antenna when located near the human body. Thus, based on the electrical properties of conductive material and the dielectric characteristics of the Felt substrate, a 5.5GHz electro-textile antenna was designed. The proposed antennas are simulated in free space, while the performance of antenna is investigated for on-body condition. The simulated impedance bandwidths of the proposed antenna in free space and on phantom are 120MHz and 110MHz at 5.5GHz respectively. The efficiencies of the antenna at 5.5GHz are 95.8% in free space, and 91.6% on phantom, respectively, meanwhile the gains of that are 8.64dB and 9.35dB, respectively.
2020 International Conference on Electrical, Communication, and Computer Engineering (ICECCE), 2020
Fog computing is an evolution of cloud computing paradigm, whose key point is the location of com... more Fog computing is an evolution of cloud computing paradigm, whose key point is the location of computing resources at the edge of the network. Data center facilities at the fog level are smaller than those at the cloud level, but nevertheless, they may share similar topologies, such as fat tree or leaf and spine architectures. In this paper, a formal algebraic specification of an IoT/Fog environment based on each of both architectures is presented, where users may be moving around and their associated computing assets are meant to migrate among hosts in order to follow their respective users so as to be as close as possible to them.
Transactions on Machine Learning and Artificial Intelligence, 2017
In this research, we will present all the concepts necessary for the implementation of a warehous... more In this research, we will present all the concepts necessary for the implementation of a warehouse of educational components. We define three classes of educational components: Learning components, services components and technical components. We built a metadata schema to describe them. We will study the warehouse architecture and how the actors interact with it. We will also see the features implemented at the indexing and search system that integrates. The aim is to clarify the strategic solutions we have adopted to create a generic platform, adaptable and scalable. The instantiation of this platform provides the Educational Component Repository.
International Journal of Organizational and Collective Intelligence, 2015
Recently, Social tagging systems (folksonomies) have become very popular platforms where content ... more Recently, Social tagging systems (folksonomies) have become very popular platforms where content is created collaboratively by users. This kind of environments allows users to assign shared resources with freely chosen keywords (tags). Folksonomies provide a valuable addition to the knowledge organization methods since they allow users to choose vocabularies that meet their real tastes and cognition. However, the lacking of standardization and the flat structure of tags in folksonomies pose challenges for folksonomy searching and information retrieval. Several researches have been proposed to overcome these drawbacks. In this paper, the authors present, describe and compare the most relevant approaches to capturing hidden semantics in folksonomies and turning it into ontologies. The authors also present and describe many techniques, tools and online resources that can be useful in working on such systems. Finally, the authors propose an approach to extract ontology from social taggi...
International Journal of Engineering Trends and Technology, 2017
cloud storage service (STaaS) are increasingly gaining popularity and becoming one of the major s... more cloud storage service (STaaS) are increasingly gaining popularity and becoming one of the major service in cloud computing. Nowadays, although many cloud storage services available on the internet they aren’t convenient and they have many challenges to apply it and benefit from it. In this paper, we will implement the model data backup technologies of our cloud storage architecture on a cloud computing simulation toolkit known as cloudsim using snapshot Amazon ec2 and disk-todisk. We will present the new concept for cloud storage architecture to be able to store and backup data through model controller in layer backup technology that can be accessed through the APIs. The implementation aims to increase the availability of data, modernizing data protection and reduce in loss of data in the cloud storage environments. Also this solution could provide new information and gives addition that is useful for further researches and open new opportunity for the future cloud storage.
Annales Des Télécommunications, 1998
In this paper, an extension of the mode matching method to the analysis of uniaxial anisotropic d... more In this paper, an extension of the mode matching method to the analysis of uniaxial anisotropic dielectric resonators is presented. The study will focus on the dominant TEol ~ though an extension to higher order modes is so'aighOeorward. The dependency of the dominant mode resonant frequency on the anisotropy parameters is analyzed in detail. Numerical results are in a very good agreement with the literature. ANALYSIS OF UNIAXIAL ANISOTROPIC DIELECTRIC RESONATORS BY THE METHOD OF MODE MATCHING R~sum6 Dans cet article, une extension de la mdthode du raccordement modal pour la ddtermination des fr6quences de rdsonance dans le cas d'un rdsonateur didlectrique (RD) anisotrope uniaxial de forme cylindrique est prdsentde. L'dtude sera limitde au mode fondamental TEoi 5. Des rdsultats numdriques importants sont present,s, ~ savoir la d6pendance de la frdquence de r6sonance des deux premiers 61dments du tenseur permittivit6 uniquement. Aussi, la sensibilit6 de la fr6quence de rdsonance aux diff6rentes perturbations de dimensions et de permittivitd est analysde.
Web 2.0 and Web 3.0 : Improve the quality of learning and minimize its cost. Adaptation process :... more Web 2.0 and Web 3.0 : Improve the quality of learning and minimize its cost. Adaptation process : personalize research data and its presentation to learners. Implementation : Fictional model to assist the learner in this massive and varied set of data.
Planning and dimensioning process of a multi-service network WCDMA should consider the whole para... more Planning and dimensioning process of a multi-service network WCDMA should consider the whole parameters characterising the radio cell. Among these, we are interested in the required total BTS power and maximum capacity supported by the cell in the downlink direction. This direction requires more radio resources, thus it is more delicate to optimize. In this context, we express these two parameters as a function of the quality of service (QoS) received at the level of a mobile station activating a certain service (voice, video, etc) and as a function of various radio interface problems such as: multipath, neighbouring cells effect, pathloss, thermal noise due to equipment, etc. Keywords— WCDMA, downlink, multi-service network, capacity estimation, interferences, total power BTS estimation.
Since the appearance of the web 2.0, several new concepts have emerged like social networks which... more Since the appearance of the web 2.0, several new concepts have emerged like social networks which generate big data, characterized by a difficult treatment using traditional administration tools. Though, they represent a rich resource of information that we can use as the basis for decisions to help managers which are always complaining about the time taken to get answers to questions in order to make decisions, and also about the quality of these decisions. In the decision-making task, the most important besides treating the data, especially big data, is to analyze and interpret the results of the treatment in a way to maximize the profit in terms of business management logic. So, we propose in this paper a process-oriented business architecture, founded on users’ interests, by analyzing tweets as an example of big data, for decisionmaking purposes, dealing with the practical functions of text mining. The business orientation of the analysis helps us to get conscious decisions whic...
Since 2004, the web 2.0 has been based on the contributions and the interaction of internet users... more Since 2004, the web 2.0 has been based on the contributions and the interaction of internet users to easily produce and publish the content. This type of philosophy which has been approved by the web community encourages users to participate and exchange, has resulted in a huge mass of diverse information. However, this philosophy based on the collaboration of users brings many problems such as the information overload, the lack of information quality’s control, the search results accuracy and possibilities of sorting and classifying by the level of relevancy. This paper is a part of a work research conducted in our laboratory that focuses on the quality of information on the collaborative web and its related issues. We propose a content management framework that will handle the content during its lifetime on the web. Our approach reuses the static validation mechanism of content and adds the concept of dynamic validation mechanism performed by internet user’s community. In this con...
Journal of Education and Vocational Research, 2015
With the emergence of the digital world, data access has become an action as quick and direct tha... more With the emergence of the digital world, data access has become an action as quick and direct that many questions arise about the reliability and value of information. However, the data returned by the online search engines are based on an open and massive environment, which include data of any type, which come from different sources of information. Indeed, in the field of education and especially when using online search, the learner is left with a set of heterogeneous information that does not exist in an orderly format and are not easy to consume. This aspect of data variety represents the second V in the design of the Big Data phenomenon. With the aim to support learners in their search for information, it is proposed to design a specialized structuring tool to combine process and classify the variety of these massive data so they can provide the best result to the learner. The present article deals with the descriptive study of the current state of using online search by UAE...
International Journal of Emerging Technologies in Learning (iJET), 2019
The most of collected data samples from E-learning systems consist of correlated information caus... more The most of collected data samples from E-learning systems consist of correlated information caused by overlapping input instances, which decrease the classifier credibility and reliability. This paper presents an improved classification model based on Deep Learning and Principal Component Analysis (PCA) method as its use in reducing the dimensionality of data. By this task, we introduce the best learning process to extract just the useful parameters that describe students’ per-formances in an E-learning system. One of the primary goals of this technique is to help earlier in detecting the dropouts and discovering of students who need special attention, so that the teachers could provide the appropriate counseling at the right time. This study presents the proposal approach and its algorithms. In addition, it shows how deep neural network was modeled in the training phase, and how PCA helps in the elimination of correlated information in our dataset to increase the classifier perfor...
International Journal of Information Technology and Computer Science, 2016
The Uplink Synchronous Transmission Scheme [1], is a technique used by operators, that exploit th... more The Uplink Synchronous Transmission Scheme [1], is a technique used by operators, that exploit the uplink orthogonality, to reduce multiple access interferences in uplink direction and consequently to increase uplink capacity. The USTS gives better performances when we have an ideal case presented by no channelization code restrictions per scrambling code. In reality, channelization codes are limited. To resolve this problem, several scrambling codes are used to admit more users in the cell. However, the use of different scrambling codes increases the multiple access interference and consequently decreases uplink capacity gain, since signals transmitted by users under different scrambling codes are non-orthogonal. To obtain more performances and therefore to increase the uplink capacity gain, we will study the introduction of a multiuser detector for interferences cancellation, in uplink synchronous mode. For that, two values of interference cancellation efficiency of the multiuser detector are considered. In this study, only the multiple access interference is reduced. To show the effect of other-cell interferences on uplink synchronous mode capacity, two scenarios are considered: an isolated cell and a multiple cell network.
International Journal of Innovation and Applied Studies, Oct 2, 2013
The printed antenna is one of the best antenna structures, due to its low cost and compact design... more The printed antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, we present a new approach to improve the radiation effectiveness and the performance of antennas by miniaturization of the size. Indeed, we have studied the performance of ultra wideband antenna which consists of a ring-shaped patch. This study was made for the whole frequency band of UWB ranging from 2.5GHz to 9.4GHz and the geometry of the antenna and the results were obtained using the simulation software CST Studio microwaves. The detailed design and the results are shown and discussed in this paper.
International Journal of Innovation and Applied Studies, Jun 15, 2013
Content Management Systems (CMS) provide to its users the ability to publish on the Web with no n... more Content Management Systems (CMS) provide to its users the ability to publish on the Web with no need to have experience in developing web pages, this way CMS also participates in the expansion of reducing quality of content placed on the web similarly to Web 2.0 tools. The mechanism of validating content indicates a high level of quality content control while putting users as main players according to Web 2.0 standards, from this prospects we develop Validated Content Management System VCMS as a new Web 2.0 tool that supports content validation mechanism. The VCMS system requires collaboration between users when content is being static validated. Real-time synchronization between users during collaboration on the same project can make this process easier and brings more rapidity to content publication while maintaining the mechanisms that allows quality control in our system. In this article we present the technic of implementing real time interaction between users during collaboration on the same content. We focus on promoting the What You See Is What You Get (WYSIWYG) editor to support Real-time collaboration between multiple content generators.. The approach presented in this paper can be integrated to any collaborative Content Management System and also can be used in all collaborative applications that generate Web content such as blogs or wikis offering to these tools the feature of collaborating on the same content between multiple users in real-time.
A novel wideband rectangular dielectric resonator antenna (DRA) is proposed in this paper. A hybr... more A novel wideband rectangular dielectric resonator antenna (DRA) is proposed in this paper. A hybrid structure with an isolated dielectric resonator (DR) and an equivalent air-dielectric DR is introduced by lifting the resonator from the ground plane. The hybrid structure is excited by a slot-fed mechanism to obtain a smooth transition between each resonant mode. The resonant modes of the isolated DR and the equivalent DR are merged together to form a wideband impedance bandwidth. It is found that the bandwidth of the proposed antenna can be greatly enhanced by using the hybrid DRA structure instead of the case mounted on the ground plane. A detailed parametric study is carried out to analyze the characteristics of the proposed antenna. Measured results show that the proposed DRA has a 10 dB impedance bandwidth of 61% from 2.4 GHz to 4.5 GHz and the radiation pattern is stable through the operating frequency.
International Journal of Information Technology and Computer Science, 2012
Web 2.0 makes users the main actors for publishing content and creating applications on the web. ... more Web 2.0 makes users the main actors for publishing content and creating applications on the web. The increasing of information overload and consequently the decrease of its quality are the main problems of this domain. Content Management Systems (CMS) provide the ability to publish on the web by offering simple publishing tools for ordinary users with no technical skills. Content available on the web created using the CMS is not well controlled and requires efficient process that evaluates its quality. Therefore, Content Management Systems contribute to the problem related to information and content quality similarly to Web 2.0 tools. The mechanism of validating content has proved a high-level of content's quality control by involving users in the process according to Web 2.0 philosophy. From these perspectives, we develop Validated Content Management System (VCMS) as a new Web 2.0 tool that supports content validation mechanisms. This article presents the VCMS and its ability to provide an effective quality control for web content. We introduce a new manner of collaborative publishing and we give an overview about features of our system and its core architecture.